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Title:Sklopljen model prenosa toplote in snovi med delcem in tokom tekočine pri razpršilnem sušenju na osnovi metode robnih elementov : doktorska disertacija
Authors:ID Gomboc, Timi (Author)
ID Hriberšek, Matjaž (Mentor) More about this mentor... New window
Files:.pdf DOK_Gomboc_Timi_2020.pdf (12,78 MB)
MD5: 6B9920F48143111616122267314C08C2
PID: 20.500.12556/dkum/7e6f7e3d-5a38-4e78-8560-cf6402527d2c
 
Language:Slovenian
Work type:Doctoral dissertation
Typology:2.08 - Doctoral Dissertation
Organization:FS - Faculty of Mechanical Engineering
Abstract:Sušenje vlažnih snovi je ena izmed najstarejših procesnih tehnik, ki se uporablja na mnogih industrijskih področjih. Pri sušenju obravnavamo zapletene fizikalne procese, ki obsegajo vezan večfazni prenos toplote, snovi in gibalne količine. Kadar obravnavamo sušenje delcev ki so porozni, moramo proces sušenja obravnavati v več stopnjah, saj delci poleg vlage na površini vsebujejo še vlago v notranjosti. V doktorski nalogi je obravnavan razvoj numeričnega modela za izračun sušenja poroznih delcev v toku sušilnega plina, pri čemer je reševanje problema izvedeno v sklopu Euler-Lagrange modela računalniške dinamike tekočin. Tako je za numerično rešitev dvofaznega prenosa toplote s premikajočo fazno mejo znotraj gibajočega se delca bil razvit numerični model na osnovi Metode robnih elementov. Razvit je bil tudi nov model za izračun povezave prenosa toplote in snovi znotraj delca s prenosom toplote in snovi v toku sušilnega plina, in sicer z nadgradnjo modela točkovnega izvora v Metodi robnih elementov za nestacionarni prevod toplote v model, ki upošteva tudi konvektivni prenos toplote in snovi v sušilnem plinu. Izvedeni testni primeri potrjujejo primernost razvitih numeričnih modelov za prostorski in časovni izračun sušenja delcev v toku sušilnega plina.
Keywords:Sušenje poroznih delcev, Kinetika sušenja poroznih delcev, Metoda robnih elementov, Razpršilno sušenje, Sklopljen model za prenos toplote in snovi, Računalniška dinamika tekočin
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[T. Gomboc]
Year of publishing:2020
Number of pages:VIII, 107 str.
PID:20.500.12556/DKUM-76001 New window
UDC:536(043.3)
COBISS.SI-ID:33807107 New window
NUK URN:URN:SI:UM:DK:RSFUXYHX
Publication date in DKUM:16.10.2020
Views:4098
Downloads:148
Metadata:XML RDF-CHPDL DC-XML DC-RDF
Categories:KTFMB - FS
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:02.04.2020

Secondary language

Language:English
Title:THE MODEL OF CONJUGATE HEAT AND MASS TRANSFER BETWEEN A PARTICLE AND A FLUID FLOW IN SPRAY DRYING BASED ON THE BOUNDARY ELEMENT METHOD
Abstract:Drying of porous particles is one of the oldest process technique which is used in different industrial applications. In drying processes, we consider complex physical processes which involve coupled multiphase heat, mass and momentum transfer. By the porous particle drying, drying process have to be treated in more stages because particles beside surface moisture includes moisture in his interior. After surface moisture removing, drying process moves in particles interior where heat transfer in particles interior has to be solved. Energy needed for drying process is supplied by hot drying gas. Through the drying process heat and mass exchange between particles and drying gas occur which results in local change of drying gas conditions. One of the most important informations in particle drying process is a drying time. To get the accurate results all interactions (drying air to particle and particle to drying air) need to be considered. In present work the 3D-axisymmetrical model for heat transfer in the spherical porous particle and fully coupled model for heat and mass transfer between particles and drying gas on the base of Boundary Elements Method was developed. Particles in coupled model were modeled as points. Results represented in this work show that keeping of coupling between particles and drying gas is very important to provide the accurate results.
Keywords:Porous particle drying, Porous particle drying kinetic, Boundary Elements Method, Spray drying, Coupled model for heat and mass transfer, Computational Fluid Dynamics


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